[BE-DB-007] be-db: Create migration for user_blocks table

VEZA_COMPLETE_MVP_TODOLIST.json

@@ -3140,7 +3140,7 @@
       "description": "Add table for user block relationships",
       "owner": "backend",
       "estimated_hours": 2,
-      "status": "todo",
+      "status": "completed",
       "files_involved": [],
       "implementation_steps": [
         {
@@ -3161,7 +3161,9 @@
         "Unit tests",
         "Integration tests"
       ],
-      "notes": ""
+      "notes": "",
+      "completed_at": "2025-12-24T15:11:31.971623",
+      "implementation_notes": "Created migration 046_user_blocks.sql for user_blocks table. Migration includes: id (UUID), blocker_id (FK to users), blocked_id (FK to users), reason (optional VARCHAR), timestamps (created_at, updated_at), unique constraint on (blocker_id, blocked_id), check constraint to prevent self-block, and appropriate indexes. Table name is \"user_blocks\" as used by SocialService."
     },
     {
       "id": "BE-DB-008",

veza-backend-api/migrations/046_user_blocks.sql

@@ -0,0 +1,35 @@
+-- 046_user_blocks.sql
+-- User Block Relationships (BE-DB-007: Create migration for user_blocks table)
+-- Add table for user block relationships
+
+-- === USER BLOCKS ===
+-- Table for tracking user-to-user block relationships
+CREATE TABLE IF NOT EXISTS public.user_blocks (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    blocker_id UUID NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
+    blocked_id UUID NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
+    
+    -- Optional reason for blocking
+    reason VARCHAR(255),
+    
+    -- Timestamps
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    
+    -- Constraints
+    CONSTRAINT uq_user_blocks_blocker_blocked UNIQUE (blocker_id, blocked_id),
+    CONSTRAINT chk_user_blocks_not_self CHECK (blocker_id != blocked_id)
+);
+
+-- Indexes
+CREATE INDEX IF NOT EXISTS idx_user_blocks_blocker_id ON public.user_blocks(blocker_id);
+CREATE INDEX IF NOT EXISTS idx_user_blocks_blocked_id ON public.user_blocks(blocked_id);
+CREATE INDEX IF NOT EXISTS idx_user_blocks_created_at_desc ON public.user_blocks(created_at DESC);
+
+-- Comments
+COMMENT ON TABLE public.user_blocks IS 'User-to-user block relationships';
+COMMENT ON COLUMN public.user_blocks.blocker_id IS 'ID of the user who is blocking';
+COMMENT ON COLUMN public.user_blocks.blocked_id IS 'ID of the user being blocked';
+COMMENT ON COLUMN public.user_blocks.reason IS 'Optional reason for blocking';
+COMMENT ON CONSTRAINT chk_user_blocks_not_self ON public.user_blocks IS 'Prevents users from blocking themselves';
+